chore: refactor packages/app files (#13236)

Co-authored-by: opencode-agent[bot] <opencode-agent[bot]@users.noreply.github.com>
Co-authored-by: Frank <frank@anoma.ly>

packages/app/src/context/comments.test.ts

@@ -109,4 +109,45 @@ describe("comments session indexing", () => {
       dispose()
     })
   })
+
+  test("remove keeps focus when same comment id exists in another file", () => {
+    createRoot((dispose) => {
+      const comments = createCommentSessionForTest({
+        "a.ts": [line("a.ts", "shared", 10)],
+        "b.ts": [line("b.ts", "shared", 20)],
+      })
+
+      comments.setFocus({ file: "b.ts", id: "shared" })
+      comments.remove("a.ts", "shared")
+
+      expect(comments.focus()).toEqual({ file: "b.ts", id: "shared" })
+      expect(comments.list("a.ts")).toEqual([])
+      expect(comments.list("b.ts").map((item) => item.id)).toEqual(["shared"])
+
+      dispose()
+    })
+  })
+
+  test("setFocus and setActive updater callbacks receive current state", () => {
+    createRoot((dispose) => {
+      const comments = createCommentSessionForTest()
+
+      comments.setFocus({ file: "a.ts", id: "a1" })
+      comments.setFocus((current) => {
+        expect(current).toEqual({ file: "a.ts", id: "a1" })
+        return { file: "b.ts", id: "b1" }
+      })
+
+      comments.setActive({ file: "c.ts", id: "c1" })
+      comments.setActive((current) => {
+        expect(current).toEqual({ file: "c.ts", id: "c1" })
+        return null
+      })
+
+      expect(comments.focus()).toEqual({ file: "b.ts", id: "b1" })
+      expect(comments.active()).toBeNull()
+
+      dispose()
+    })
+  })
 })